<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    div {
      width: 300px;
      height: 300px;
      background-color: pink;
      margin: 0 auto;
    }
  </style>
</head>
<body>
<div></div>
</body>
</html>
